Note that it is possible to print these overheads with more than 1 slide
per page. In Windows, in the Print Dialog, click on the Properties
button. There should be an entry for Pages Per Sheet. Play around a bit
to find a number of slides per page that works well for you. If you use
4 per sheet, you may find choosing landscape works better that portrait.
The availability will depend on your printer driver. For the Mac,
there is something similar, but I don't have one handy to check it.